JP2004147014A - Picture display system, picture input device and picture display device, which are used for the same, and control method of picture display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To speedily display a picture from a digital camera on a picture display device. <P>SOLUTION: The pictures photographed by the digital camera (DC) 30 are set in order by file ID and are stored in a memory 34 as picture files. When a request of picture display is made from DC 30, the picture display device 40 acquires file ID of the picture whose display is requested from DC 30, acquires the picture file from DC 30 with file ID as a key and performs a display processing of the picture. After the display processing, the file ID acquires the preceding and following picture files from DC 30 and stores them in a memory 44. When a change of the display picture is requested from DC 30, the picture display device 40 acquires file ID of the picture on the change from DC 30, checks whether the picture file corresponding to acquired file ID is stored in the memory 44 or not and displays the picture based on the picture file if the file is stored. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image display system, an image input device used therefor, an image display device, and an image display control method, and more particularly, to an image input device capable of inputting an image and storing a plurality of images and an image display device displaying the image. And an image display system, an image input device, an image display device, and an image display control method used in the image display system.
[0002]
[Prior art]
Conventionally, a USB (Universal Serial Bus) has been known as a communication interface for connecting a general-purpose computer and a peripheral device. When the computer and the peripheral device are connected by the USB, the computer normally functions as a host and controls the peripheral device subordinately. Therefore, a computer supporting USB is equipped with a host controller for functioning as a host. In the USB standard, a format for transmitting and receiving data to and from a personal computer is defined for each device function, and is defined as a device class. The device class includes a storage class, an HID class, an STI class, a printer class, and the like.
[0003]
A device that directly connects a digital camera and a printer via a USB without using a computer has been proposed (see Patent Document 1). In this technology, a digital camera is connected as a mass storage class device by providing a printer with a host function in accordance with the USB standard, and an image stored in the digital camera is operated by an operation panel provided in the printer. The printer can print without going through a computer.
[0004]
[Patent Document 1]
JP 2001-290612 A (FIG. 1)
[0005]
[Problems to be solved by the invention]
However, as described above, the USB standard presupposes that a computer has a host function and is connected to peripheral devices. Therefore, when devices other than a computer are connected to each other using a USB, The question is whether it is preferable for the device to function as a host. Now, consider a case where a digital camera and a display device such as a projector are connected via a USB, and the image file recorded in the digital camera is used for reproduction on the display device. At this time, in consideration of improvement in operability, it is preferable that the digital camera be provided with a function as a host in order to enable the reproduction operation by the digital camera alone. However, considering the improvement in portability of digital cameras, it is a reality that digital cameras have a memory area for storing a large amount of device drivers for controlling devices from the host and a host function that requires a large current supply. Not a target. For this reason, there is a demand for the construction of a system for displaying an image file stored in a digital camera on a display device by an operation from the digital camera.
[0006]
In recent years, the performance of digital cameras has been remarkably improved, and the quality of captured images has been increasing, and the amount of information of recorded images has also tended to increase. Therefore, in the method in which an image file corresponding to the image is transmitted from the digital camera every time the image is reproduced on the display device, the processing time from transmission of the image file to generation and reproduction of the image data becomes long. As a result, a large time lag occurs between the time when the image reproduction is instructed from the digital camera side and the time when the image is reproduced by the projector.
[0007]
The image display system of the present invention and the image input device and the image display device used in the image display device solve such a problem, and display an image input to the image input device via a communication interface of a predetermined communication standard. One of the purposes is to display on a device. Further, the image display system of the present invention, the image input device used for the image display device, and the image display device can quickly convert an image input to the image input device to an image display device connected via a communication interface of a predetermined communication standard. One of the purposes is to display. Still another object of the present invention is to provide an image display system, an image input device used therein, and an image display device that allow a system including an image input device and an image display device to function without passing through a computer.
[0008]
[Means for Solving the Problems and Their Functions and Effects]
An image display system, an image input device, an image display device, and an image display control method used in the present invention employ the following means in order to achieve at least a part of the above object.
[0009]
The image display system of the present invention includes:
An image display system in which an image input device capable of inputting and storing a plurality of images and an image display device displaying an image are connected via a communication interface of a predetermined communication standard,
(A) The image input device comprises:
Image display instructing means for instructing the image display device to display any one of the plurality of stored images,
Image file transmitting means for transmitting the instructed image file to the image display device when transmission of an image file is instructed from the image display device;
With
(B) the image display device comprises:
Image display instruction receiving means for receiving an image display instruction by the image display instruction means of the image input device;
When the instruction is received, at least image file transmission instructing means for instructing the image input device to transmit an image file of the image whose display is instructed,
Image file receiving means for receiving the image file transmitted by the image file transmitting means of the image input device based on the instruction,
Image display executing means for executing image display based on the received image file;
The gist is to provide
[0010]
In this image display system of the present invention, the image input device instructs the display of any one of the plurality of stored images to the image display device connected via a communication interface of a predetermined communication standard, When the transmission of the image file is instructed from the image display device, the instructed image file is transmitted to the image display device. Then, the image display device receives an instruction to display an image from the image input device, and when the instruction is received, instructs the image input device to transmit at least an image file of the image whose display is instructed, and based on the instruction, Receiving the image file transmitted by the image input device, and displaying the image based on the received image file. That is, an image from the image input device can be displayed on the image display device by transmitting the image file stored in the image input device to the connected image display device via a communication interface of a predetermined communication standard. .
[0011]
In the image display system of the present invention, the image display device includes an image file storage unit capable of storing a plurality of image files received by the image file reception unit, and the image file transmission instruction unit of the image display device includes: Means for instructing the image input device to transmit a plurality of image files including an image file corresponding to the image for which the display is instructed, wherein the image display execution means of the image display device comprises: When an image file corresponding to the image file is stored in the image file storage means, an image is displayed based on the stored image file, and the image file corresponding to the image whose display is instructed is stored in the image file storage unit. If the image file is not stored in the image file transmission means, It may be assumed to be a means for performing the display of the image based on the received image file by file receiving means. The image display device stores a plurality of image files transmitted from the image input device, and stores the image file corresponding to the image when an instruction to display the image is given later. Since the display of the image is executed based on the image file that is present, the image whose display has been instructed can be promptly displayed on the image display device.
[0012]
In the image display system according to the aspect of the present invention, the plurality of images stored in the image input device are stored in an ordered manner, and the image file transmission instructing means of the image display device is instructed to perform the display. The image display device may be a means for instructing the image display device to transmit an image file before or after the image file corresponding to the image together with the image file corresponding to the image whose display is instructed.
[0013]
Further, in the image display system according to the aspect of the invention, wherein the image display device includes an image file storage unit capable of storing a plurality of image files, the image file transmission instruction unit of the image display device corresponds to the image whose display is instructed. When at least a part of the plurality of image files including the image file to be stored is stored in the image file storage unit, the image file among the plurality of image files is replaced with an instruction to transmit the plurality of image files. It may be a means for instructing transmission of an image file not stored in the storage means. By doing so, the number of transmissions and receptions of image files can be reduced, so that the processing load associated with transmission and reception of image files can be reduced.
[0014]
Further, in the image display system according to the aspect of the invention, wherein the image display device includes an image file storage unit capable of storing a plurality of image files, the image file transmission instruction unit of the image display device corresponds to the image whose display is instructed. Means for instructing that an image file corresponding to the image whose display is instructed is transmitted in preference to an image file other than the image file among a plurality of image files including the image file to be displayed. You can also. With this configuration, the image file of the image whose display has been instructed is preferentially received among the plurality of image files, so that the image whose display has been instructed can be promptly displayed on the image display device.
[0015]
Alternatively, in the image display system according to the aspect of the invention, wherein the image display device includes an image file storage unit capable of storing a plurality of image files, the image file transmission instruction unit of the image display device corresponds to the image whose display is instructed. Out of a plurality of image files including the image file to be displayed, the image files other than the image file corresponding to the image whose display is instructed are ready to be displayed by the image display executing means. It may be a means to instruct to be transmitted later. By doing so, it is possible to receive and store an image file other than the image file of the image whose display has been instructed without hindering the display processing of the image whose display has been instructed. Here, “after the image is ready for display” is not limited to after the display of the image whose display is instructed is performed, and the image display processing is performed by receiving the image file of the image whose display is instructed. Is also included during the execution of.
[0016]
In the image display system according to the aspect of the invention, the image input device may include an image display device capable of displaying the plurality of stored images as thumbnail images, and an image displayed on the image display device using the displayed thumbnail images. And a selection unit that can select. In this case, the operability of the image input device can be further improved.
[0017]
In the image display system according to the present invention, the image input device may be a photographing device that inputs an image by photographing.
[0018]
Further, in the image display system of the present invention, the communication interface of the predetermined communication standard is an interface that communicates so that one controls the other subordinately, and the image input device is subordinate according to the predetermined communication standard. The image display device may further include a non-dependent communication unit that is controlled in accordance with the predetermined communication standard. Since communication between the image input device and the image display device is performed using the image display device as a host, the size of the image input device can be reduced.
[0019]
The image input device of the present invention includes:
An image input device in an image display system in which an image input device capable of inputting and storing a plurality of images and an image display device displaying an image are connected via a communication interface of a predetermined communication standard,
Image display instructing means for instructing the image display device to display any one of the plurality of stored images,
When at least an image file transmission of an image whose display is instructed is instructed from an image display device that receives the display instruction and executes image display in response to transmission of the image file, the instructed image file is copied. Image file transmitting means for transmitting to the image display device;
The gist is to provide
[0020]
In the image input device of the present invention, the display of any one of the plurality of stored images is instructed to an image display device connected via a communication interface of a predetermined communication standard, and the display instruction is issued. When the image display device that receives and transmits the image file and displays the image in response to the transmission of at least the image file of the image whose display is instructed is instructed, the image file instructed is transmitted to the image display device. That is, an image can be displayed on the image display device by transmitting the image file stored in the image input device to the connected image display device via a communication interface of a predetermined communication standard.
[0021]
The image display device of the present invention includes:
An image display device in an image display system in which an image input device capable of inputting and storing a plurality of images and an image display device displaying an image are connected via a communication interface of a predetermined communication standard,
An image display instruction receiving unit that receives an instruction to display any one of the plurality of images stored in the image input device from the image input device;
When the instruction is received, at least image file transmission instructing means for instructing the image input device to transmit an image file of the image whose display is instructed,
Image file receiving means for receiving the image file transmitted by the image file transmitting means of the image input device based on the instruction,
Image display executing means for executing image display based on the received image file;
The gist is to provide
[0022]
In the image display device of the present invention, an instruction to display any one of the plurality of images stored in the image input device connected via the communication interface of the predetermined communication standard is received from the image input device, When this instruction is received, at least instructing the image input device to transmit an image file of the image whose display is instructed, receiving the image file transmitted by the image input device based on the instruction, and receiving the received image file Perform image display based on the file. That is, by receiving an image file from an image input device connected via a communication interface of a predetermined communication standard, an image can be displayed based on the image file.
[0023]
An image display control method according to the present invention includes:
Controlling the display of an image by the image display device in an image display system in which an image input device capable of inputting and storing a plurality of images and an image display device displaying the image are connected via a communication interface of a predetermined communication standard A method of controlling image display,
The image input device is instructed to display any one of the stored images by the image display device, and when the image display device instructs transmission of an image file, the transmission is instructed. Controlling the transmitted image file to the image display device,
The image display device receives an instruction to display an image from the image input device, and when the instruction is received, instructs the image input device to transmit at least the image file of the image whose display is instructed, The gist is that an image file transmitted by the image input device is received based on the instruction, and display of an image is executed based on the received image file.
[0024]
In the image display control method of the present invention, the image input device is instructed to display any one of the plurality of stored images to the image display device, and the image display device is instructed to transmit an image file. Is controlled so that the image file instructed to be transmitted when transmitted is transmitted to the image display device. Then, an image display device connected to the image input device via a communication interface of a predetermined communication standard is received an image display instruction from the image input device, and at least the display is instructed when the instruction is received. The image input device is instructed to transmit the image file of the received image, the image file transmitted by the image input device is received based on the instruction, and the image is displayed based on the received image file. Control so that That is, an image from the image input device can be displayed on the image display device by transmitting the image file stored in the image input device to the connected image display device via a communication interface of a predetermined communication standard. .
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described using examples. FIG. 1 is a configuration diagram schematically showing the configuration of an image display system 20 according to one embodiment of the present invention. As shown in the figure, the image display system 20 of the embodiment is configured such that a digital camera 30 as an image input device and an image display device 40 are connected by a USB communication interface cable 50.
[0026]
The digital camera 30 is mainly composed of a camera controller 31 that controls each unit in response to an input from an operation unit 36, and includes a color liquid crystal display panel 32 that displays a subject and displays necessary for various operations. And a memory for assigning and storing a file ID for identifying an image file to an image file created by the camera controller 31 based on the electric signal from the imaging device 33 34, and a mass storage class USB device controller 35 in the USB standard for communicating with a USB host. The operation unit 36 includes, for example, various operation buttons such as a shutter button 36a, a mode dial 36b, a cross button 36c, a menu button 36d, and an enter button 36e, as shown in FIG. In particular, among the operation buttons constituting the operation unit 36, the mode dial 36b is used for various operations such as a "photographing mode" for photographing the subject and a "playback mode" for reproducing the photographed subject on the color liquid crystal display panel 32. The mode can be selected by dial operation.
[0027]
As shown in FIG. 1, the image display device 40 mainly includes an image display controller 41 that controls each unit, and includes an image display unit 42 that displays an image, and an image file that is displayed on the image display unit 42. And a USB host controller 45 for communicating with a USB device. The image display device 40 can be configured as, for example, a display device such as a projector illustrated in FIG.
[0028]
FIG. 4 is a diagram showing a storage structure of the memory 34 of the digital camera 30. As shown in FIG. 4, in the memory 34, a directory (DCIM) for storing a still image is created under a root directory (Root), and directories (100ABC, 102ABC, etc.) for storing image files are created under the DCIM directory. ) Has been created. Image files (ABC0001.JPG, ABC0002.JPG, ABC0003.JPG, ABC0004.JPG, etc.) created by the camera controller 31 are stored in the image file storage directory. The image file is a file ID (number) corresponding to the path information of the image file, more specifically, a number (for example, 100ABC) composed of the directory number of the DCIM directory in which the image file is stored and the file number of the image file. The file IDs of the image files “ABC0001.JPG” stored in the directory are ordered by “1000001”. Note that the ordering of the image files is not limited to that performed using the file ID, and may be performed using any other method, such as one that is arbitrarily ordered by the shooting date and time or the operation of the operator. .
[0029]
Next, communication in the image display system 20 of the embodiment, that is, communication between the digital camera 30 and the image display device 40 will be described. Communication between the digital camera 30 and the image display device 40 according to the embodiment is performed using a USB device controller 35 and a USB host controller 45. Communication between the USB device controller 35 and the USB host controller 45 includes a control pipe 51 used for transmitting various commands, a bulk pipe 52 used for transmitting data such as image files, and an interrupt, as shown in FIG. This is performed using three logical pipes (communication channels) of the pipe 53. Among these pipes, the interrupt pipe 53 does not specify any communication in the mass storage class in the USB standard. In the image display system 20 of the embodiment, by using the interrupt pipe 53, the image display device 40 is operated by operating the digital camera 30, even though the image display device 40 is a USB host.
[0030]
Specifically, first, a command for inquiring a request from the digital camera 30 from the image display device 40 at an extremely short time (for example, every 1 msec) with respect to the time required for a human operation using the interrupt pipe 53 (in the embodiment, , An interrupt-in command [Interrupt In command]) is transmitted to the digital camera 30 side, and every time this interrupt-in command is received from the digital camera 30, if there is no request, there is no request. A meaning "NAK" is transmitted as a response, and if there is any request, a control command corresponding to the request is transmitted as a response. When the image display device 40 receives a control command from the digital camera 30 as a response to the interrupt-in command, the image display controller 41 of the image display device 40 analyzes the control command and executes an operation corresponding to the control command. You do it. Hereinafter, a process for transmitting an image file stored in the memory 34 of the digital camera 30 from the digital camera 30 to the image display device 40 and displaying an image on the image display device 40 using such communication will be described.
[0031]
When displaying an image from the digital camera 30 on the image display device 40, the image displayed (reproduced) on the image display device 40 is requested by the operation of the operation unit 36 by the operator, and the image to be displayed on the image display device 40 is displayed. Is executed when is selected. The image display request to the image display device 40 is made, for example, by operating the mode dial 36b to select the "playback mode" as the operation mode and pressing the menu button 36d to display the menu on the color liquid crystal display panel 32 and display the image. The operation is performed by selecting “external playback” from the menu displayed by operating the cross button 36c and pressing the enter button 36e. The selection of an image to be displayed on the image display device 40 is performed, for example, by operating the cross button 36c using the thumbnail display when the image stored in the memory 34 is displayed as a thumbnail in response to the image display request. This is performed by selecting an image and pressing the determination button 36e. At this time, the thumbnails are displayed in the order of the file IDs. FIG. 6 shows an example of a thumbnail display on the color liquid crystal display panel 32.
[0032]
When display of an image on the image display device 40 is requested, the camera controller 31 of the digital camera 30 generates a control command for requesting display of the image on the image display device 40 and interrupts the control command. It is transmitted to the image display device 40 as a response to the IN command. In the image display device 40, as an operation of the analysis result of the control command, the operation of the image selected by the operation of the digital camera 30 and stored in the memory 34 of the digital camera 30 connected as a storage class by USB is performed. A process of reading a file ID, reading an image file stored in the memory 34 of the digital camera 30 using the read file ID as a key, and displaying an image on the image display unit 42 based on the read image file is performed. The read image file is stored in the memory 44 of the image display device 40. Further, after performing the process of displaying the image, the image file whose order of file ID is the image file whose order is one before and the image file whose order is one after (for example, the display is Processing for reading out the requested image file of ID “1000004” from the memory 34 of the digital camera 30 and the image file of ID “1000003” and the image file of ID “1000005” and storing them in the memory 44 of the image display device 40 (Image file prefetching process). This is because, when a request for displaying the next image or displaying the previous image is made to the image displayed on the image display device 40 later, the image is stored in the memory 44 of the image display device 40. This is because an image can be quickly displayed using the stored image file. In addition, for reading out only two image files, the image file of which order is one before and one after, for the image file requested to be displayed, the image file is stored in the memory 44 of the image display device 40. This is because the number of image files is reduced to reduce the amount of memory 44 used.
[0033]
Thereafter, when a request to change the image displayed on the image display device 40 using the thumbnail display on the color liquid crystal display panel 32 is made, the camera controller 31 of the digital camera 30 requests the image display device 40 to change the image display. A control command is generated to transmit the control command to the image display device 40 as a response to the interrupt-in command. Here, the request to change the image to be displayed on the image display device 40 is made by, for example, selecting the desired image by operating the cross button 36c using the thumbnail display illustrated in FIG. be able to. In the image display device 40 which has received the control command requesting the change of the image display, as the operation of the analysis result of the control command, the file ID of the changed image selected by the operation of the digital camera 30 is stored in the memory 34 of the digital camera 30. Reading is performed and a process of searching for an image file stored in the memory 44 of the image display device 40 is performed using the read file ID as a key. As a result of the search, when an image file corresponding to the read file ID is stored in the memory 44 of the image display device 40, a process of reading the image file from the memory 44 and displaying the image file on the image display unit 42 is performed. Thereby, the processing can be sped up as compared with the case where the image file is read from the memory 34 of the digital camera 30. On the other hand, when the image file corresponding to the read file ID is not stored in the memory 44 of the image display device 40, the corresponding image file is read from the memory 34 of the digital camera 30 based on the file ID, and the read image file is read. A process for displaying an image on the image display unit 42 is performed based on.
[0034]
After the processing for displaying the image is performed in this manner, the image file whose file ID is one immediately before and the image file whose order is one after the image ID of the image file of the displayed image are stored in the memory 44 of the image display device 40. It is determined whether or not the image file is stored in the digital camera 30. If it is determined that the image file is not stored, the image file that is not stored is read out from the memory 34 of the digital camera 30, and the image display device 40 A process for updating the image file stored in the memory 44 is performed. As a result, in the memory 44 of the image display device 40, the three image files of the image file of the image displayed on the image display unit 42 and the file ID of the image file of the immediately preceding image file and the image file of the next image file are displayed. Will be stored. Therefore, if an image displayed on the image display unit 42 of the image display device 40 is selected by the operation of the digital camera 30 so as to select the next image or the previous image and to request the display, the image display device At 40, the image file stored in the memory 44 can be read and the image can be displayed, and the processing can be speeded up.
[0035]
Next, the state of communication between the digital camera 30 and the image display device 40 will be described in further detail. FIG. 7 is a sequence diagram showing an example of a communication procedure when a communication connection by USB is established between the digital camera 30 and the image display device 40. The digital camera 30 and the image display device 40 are connected by the USB communication interface cable 50 while the power is on, or the digital camera 30 and the image display device 40 are connected by the USB communication interface cable 50 Is input, first, as shown in the sequence illustrated in FIG. 7, a USB communication connection is established, and the USB host controller 45 of the image display device 40 is switched from the USB device controller 35 of the digital camera 30 to a USB device. A device descriptor describing the configuration is obtained (S100). This device descriptor includes an interface descriptor including a fact that the digital camera 30 is a device of the mass storage class and a string descriptor listing USB endpoints used by the digital camera 30. In the embodiment, the string descriptor listing the endpoints describes the “Interrupt In” endpoint as an additional endpoint. As a result, the USB host controller 45 of the image display device 40 according to the embodiment determines from the interface descriptor and the string descriptor that the digital camera 30 is a mass storage class device and an interrupt-in command (a command for inquiring a request on the USB device side). ) Can be recognized as a device. When the digital camera 30 is connected to the USB port of a normal computer, the device descriptor is sent to the computer in the same manner, but the USB host controller incorporated in the computer ignores the additional “Interrupt In” endpoint. The digital camera 30 operates as a normal mass storage class device for the computer.
[0036]
When the USB communication connection is established between the digital camera 30 and the image display device 40 in this manner, the image display device 40 sends an interrupt-in command at an extremely short time interval (for example, 1 msec interval) using the interrupt pipe 53. Then, a process for transmitting to the digital camera 30 is started (S102 and S108), and a "Confirmation" command for confirming the protocol within a predetermined time after the communication connection is established (S106). By transmitting this command, the image display device 40 notifies that the communication protocol of the type using the interrupt-in command is used, the protocol version, and the like.
[0037]
Each time the digital camera 30 receives the interrupt-in command, the digital camera 30 checks whether any control command has been generated at that point in time. When no control command has been generated, the digital camera 30 sets “NAK” meaning no request, to some form. When the control command is issued, the control command is transmitted to the image display device 40 using the control pipe 51 as a response to the interrupt-in command. In the example of FIG. 7, “StatusReq” which is a control command as a request for acquiring the state of the image display device 40 with the digital camera 30 in response to the interrupt-in command in S108 is displayed from the digital camera 30 as a response. The data is transmitted to the device 40 (S110). The image display apparatus 40 checks the state of the apparatus in response to the control command, and when the apparatus is in a state capable of accepting a display request, sends the control pipe 51 a command "SEND_STATUS" to notify the transmission of the state of the apparatus. Is transmitted to the digital camera 30 by using (S112), and “PLAY_OK”, which is a code in which the device can receive a display request, is written into a predetermined area in the memory 34 of the digital camera 30 by using the bulk pipe 52. (S114). The digital camera 30 displays on the color liquid crystal display panel 32 the state of the image display device 40 thus obtained (a state in which an image display request can be accepted).
[0038]
FIG. 8 is a sequence diagram showing an example of a communication procedure when an image display request is issued from the digital camera 30 and the image display device 40 displays an image. This sequence is performed when a request to display an image on the image display device 40 is made. First, in the digital camera 30, a control command “PlayReq”, which is a request for notifying that an image display request has been generated by the processing of the camera controller 31, is generated. This control command is transmitted from the digital camera 30 to the image display device 40 using the control pipe 51 in response to the interrupt-in command (S200) transmitted from the image display device 40 (S202). The image display device 40 transmits “GET_PLAYREQ”, which is a command for acquiring an image display request in response to the received “PlayReq” command, to the digital camera 30 using the control pipe 51 (S204). The file ID (“1000004” in the embodiment) of the requested image is read from the memory 34 of the digital camera 30 via the bulk pipe 52, and the image file is read from the memory 34 of the digital camera 30 using the read file ID as a key. (S206, S208) Then, a process of displaying an image on the image display unit 42 based on the read image file is performed. After the process of displaying the image is performed, the image ID of the displayed image file is one before and one after the image file (in the embodiment, the image file of “1000004” is added to the image file). On the other hand, image files having file IDs “1000003” and “1000005” are read from the memory 34 of the digital camera 30 in advance (S210), and the read image files are stored in a predetermined area of the memory 44 of the image display device 40.
[0039]
In response to the interrupt-in command transmitted from the image display device 40 after accepting the display request in this way, “StatusReq” which is a control command of the request for acquiring the state of the device from the digital camera 30 is transmitted as a response. Then (S214), the image display device 40 transmits “SEND_STATUS”, which is a command for notifying the transmission of the status of the device, to the digital camera 30 using the control pipe 51 (S216), and the command is normally received. “CMDACPT”, which is a code indicating that the operation has been performed, is transmitted to the digital camera 30 using the control pipe 51 (S218). Note that “id01” immediately after the code “CMDACPT” in the figure is an id number for identifying the display job on the digital camera 30 side. Hereinafter, the same applies to “id01” immediately after other codes. After receiving the “CMDACPT” code indicating that the “playReq” command has been normally received, the digital camera 30 requests a “CImageReq” command for requesting a change of a display image to be described later or an end of image display. Unless a “CompleteReq” command has been generated, the “SEND_STATUS” command is continuously transmitted.
[0040]
When a request to change the display image is made to the digital camera 30, the digital camera 30 generates “CImageReq” as a control command requesting the image display device 40 to change the display image, and generates an interrupt-in command. The response is sent to the image display device 40 (S222). The image display device 40 transmits “GET_CHIMAGEREQ”, which is a command for acquiring the change display request in response to the received “CImageReq” command, to the digital camera 30 using the control pipe 51 (S224). The file ID (“1000005” in the embodiment) of such an image is read out via the bulk pipe 52 (S226). Then, by the processing of the image display controller 41 of the image display device 40, the image file stored in the memory 44 of the image display device 40 is searched by using the read file ID as a key, and the search results correspond to the obtained file ID. If there is an image file to be read, the image file is read from the memory 44 and the image is displayed on the image display unit 42. In the embodiment, since the image file corresponding to the file ID “1000005” is stored in the memory 44 of the image display device 40, the image file is read from the memory 44 and the image display process is performed. Then, after the image display processing is performed, the image file (file ID is “1000005”) of the displayed image is in the same order as the image file whose file ID is immediately before (“1000004”). It is determined whether or not the next (“1000006”) image file is stored in the memory 44 of the image display device 40. If it is determined that the image file is not stored, the image file not stored is transferred to the digital camera. The image file stored in the memory 44 of the image display device 40 is updated based on the read image file. Here, since the image file with the file ID “1000004” is stored in the memory 44 of the image display device 40, only the image file with the file ID “1000006” is read from the memory 34 of the digital camera 30 in advance (S228). The image file having the file ID “1000006” is stored in the memory 44 by overwriting the image file having the file ID “1000003”. It is needless to say that the image file with the file ID “1000003” may be stored as it is, that is, the image file acquired in the past may be stored as it is.
[0041]
After such a change operation of the display screen, when a request to end the image display is made, for example, “end external reproduction” is selected by operating the cross button 36c on the menu screen displayed by pressing the menu button 36d. When the enter button 36e is pressed, the digital camera 30 transmits a “CompleteReq” command for requesting termination of image display as a response to the interrupt-in command (S232), and the image display device 40 that has received the transmission transmits the “CompleteReq” command. A process for ending the display of the image is performed. Then, when a “StatusReq” command transmitted from the digital camera 30 in response to the interrupt-in command after receiving the end request is transmitted (S236), “SEND_STATUS” notifying of the transmission of the status of the device is transmitted. The command is transmitted to the digital camera 30 via the control pipe 51 (S238), and “COMPid01”, which is a code indicating that the command has been normally received and the image display has been completed, is transmitted to the digital camera 30 (S240). ), The image display processing ends.
[0042]
According to the image display system 20 of the embodiment described above, when an image display request is made from the digital camera 30 side, the image display device 40 changes the file ID of the image requested to be displayed to the digital camera 30. Since the image file acquired from the memory 34 and the acquired image file corresponding to the acquired file ID are acquired from the memory 34 of the digital camera 30 and the image is displayed, the image file stored in the digital camera 30 To display the image. In addition, the image display device 40 also acquires two image files, the image file of which order is one before and one after, for the image file instructed to be displayed, and stores it in the memory 44. Since the information is stored, when a request to change the display of the image to the next image or the previous image is made later, the image is stored not in the memory 34 of the digital camera 30 but in the memory 44 of the image display device 40. An image can be displayed based on the image file, and display processing can be speeded up. Further, the acquisition of these two image files is performed after the display processing of the image requested to be displayed, so that the display processing of the image originally requested to be displayed is not hindered. Furthermore, since the digital camera 30 uses a mass storage class of the USB standard and performs processing using an interrupt-in command only at the time of USB connection with the image display device 40, the digital camera 30 is a normal mass storage class. It can be connected to a computer as a class USB device.
[0043]
Here, in the image display system 20 of the embodiment, the digital camera 30 corresponds to an image input device capable of inputting and storing a plurality of images, and one of the devices to which the USB is connected is a predetermined device in which the other is controlled in a dependent manner. It corresponds to a communication standard. In addition, the USB device controller 35 of the digital camera 30 corresponds to a subordinate communication unit that is subordinately controlled in a predetermined communication standard, and the camera controller 31 displays one of the stored images. This corresponds to image display instructing means for instructing the image display device 40 and image file transmitting means for transmitting an image file to the image display device 40. Further, the USB host controller 45 of the image display device 40 corresponds to a non-dependent communication device on the side controlled dependently on a predetermined communication standard, and the image display controller 41 receives an image display instruction from the image input device. Display instruction receiving means, image file transmission instructing means for instructing the image input device to transmit an image file, image file receiving means for receiving an image file transmitted from the image input device, and display of an image based on the received image file And an image display executing means for executing the above.
[0044]
In the image display system 20 according to the embodiment, reading of the image file whose file ID is one before and one after the image file requested to be displayed is completed, and the display processing of the image requested to be displayed is completed. After the image file of the image requested to be displayed is acquired from the memory 34 of the digital camera 30, the display processing of the image requested to be displayed is determined to be ready for displaying the image. It may be read before the end.
[0045]
In the image display system 20 of the embodiment, as an image file read out from the memory 34 of the digital camera 30 and stored in the memory 44 of the image display device 40 in advance, a file ID of the image file of the image requested to be displayed is assigned. Is stored with the previous image file and the next image file. However, only the image file with the next file ID order is acquired and stored. May acquire and store only the previous image file. Further, an image file having a file ID other than the above may be acquired and stored.
[0046]
In the image display system 20 of the embodiment, it is checked whether the reading (pre-reading) of the image file other than the image file requested to be displayed from the memory 34 of the digital camera 30 is stored in the memory 44 of the image display device 40. However, reading from the memory 34 of the digital camera 30 may be performed regardless of whether or not the data is stored in the memory 44 of the image display device 40. That is, the image file stored in the memory 44 of the image display device 40 may be reacquired from the memory 34 of the digital camera 30.
[0047]
In the image display system 20 of the embodiment, the USB is used as a predetermined communication standard in which one of the connected devices controls the other independently, but the communication standard in which the image display device 40 controls the digital camera 30 in a dependent manner. Any communication standard can be used.
[0048]
In the image display system 20 of the embodiment, the digital camera 30 has been described as an example of the image input device. However, any device may be used as long as the device can input and store a plurality of images.
[0049]
In the embodiment, the present invention has been described as the image display system 20. However, the present invention is not limited to the form of the system, and may be a form of the digital camera 30 or the image display device 40 used in the image display system 20. Further, a mode of a control method for controlling the digital camera 30 and the image display device 40 constituting the image display system 20 may be adopted.
[0050]
As described above, the embodiments of the present invention have been described using the examples. However, the present invention is not limited to these examples, and may be implemented in various forms without departing from the gist of the present invention. Obviously you can get it.
[Brief description of the drawings]
FIG. 1 is a configuration diagram schematically illustrating the configuration of an image display system 20 according to an embodiment.
FIG. 2 is a configuration diagram illustrating an external configuration of the digital camera 30;
FIG. 3 is a configuration diagram illustrating an external configuration of an image display device;
FIG. 4 is an explanatory diagram showing a storage structure of a memory 34 of the digital camera 30.
FIG. 5 is an explanatory diagram illustrating a logical pipe used for command transmission and the like;
FIG. 6 is a diagram showing an example of a thumbnail display.
FIG. 7 is a sequence diagram showing an example of a communication procedure when a communication connection is established.
FIG. 8 is a sequence diagram showing an example of a communication procedure when executing image display.
[Explanation of symbols]
Reference Signs List 20 image display system, 30 digital camera, 31 camera controller, 32 color liquid crystal display panel, 33 shooting device, 34 memory, 35 USB device controller, 36 operation unit, 36a shutter button, 36b mode dial, 36c cross button, 36d menu button , 36e Enter button, 40 image display device, 41 image display controller, 42 image display unit, 44 memory, 45 USB host controller, 50 USB communication interface cable, 51 control pipe, 52 bulk pipe, 53 interrupt pipe.

Claims (12)

An image display system in which an image input device capable of inputting and storing a plurality of images and an image display device displaying an image are connected via a communication interface of a predetermined communication standard,
(A) The image input device comprises:
Image display instructing means for instructing the image display device to display any one of the plurality of stored images,
When transmission of an image file is instructed from the image display device, an image file transmission unit that transmits the instructed image file to the image display device,
(B) the image display device comprises:
Image display instruction receiving means for receiving an image display instruction by the image display instruction means of the image input device;
When the instruction is received, at least image file transmission instructing means for instructing the image input device to transmit an image file of the image whose display is instructed,
Image file receiving means for receiving the image file transmitted by the image file transmitting means of the image input device based on the instruction,
An image display system comprising: an image display execution unit configured to display an image based on the received image file. The image display system according to claim 1, wherein
The image display device includes an image file storage unit capable of storing a plurality of image files received by the image file reception unit,
Image file transmission instructing means of the image display device is means for instructing the image input device to transmit a plurality of image files including an image file corresponding to the image whose display is instructed,
The image display execution means of the image display device executes display of an image based on the stored image file when an image file corresponding to the image whose display is instructed is stored in the image file storage means. When an image file corresponding to the image whose display is instructed is not stored in the image file storage unit, the image file received by the image file receiving unit based on a transmission instruction by the image file transmission instruction unit is An image display system which is a means for displaying an image based on the image. The image display system according to claim 2, wherein
The plurality of images stored in the image input device are stored in order,
The image file transmission instructing means of the image display device transmits the image file before or after the image file corresponding to the image whose display is instructed together with the image file corresponding to the image whose display is instructed. An image display system which is a means for instructing a display device. The image display system according to claim 2 or 3,
The image file transmission instruction means of the image display device, when at least a part of a plurality of image files including an image file corresponding to the image whose display is instructed is stored in the image file storage means, An image display system which is means for instructing transmission of an image file which is not stored in the image file storage means among the plurality of image files, instead of the instruction of transmission of the plurality of image files. The image display system according to claim 2, wherein
The image file transmission instructing means of the image display device includes, among a plurality of image files including an image file corresponding to the image whose display is instructed, an image file corresponding to the image whose display is instructed, An image display system which is a means for instructing that an image file other than the above is transmitted in priority. The image display system according to claim 2, wherein:
The image file transmission instructing means of the image display device includes, among a plurality of image files including an image file corresponding to the image whose display is instructed, image files other than the image file corresponding to the image whose display is instructed. An image display system for instructing transmission of the image whose display has been instructed by the image display execution unit after preparation for display is completed. The image display system according to claim 1, wherein:
The image input device includes: an image display device capable of displaying the plurality of stored images as thumbnail images; and a selection unit capable of selecting an image to be displayed on the image display device using the displayed thumbnail images. Image display system. The image display system according to claim 1, wherein:
An image display system, wherein the image input device is a photographing device that inputs an image by photographing. The image display system according to claim 1, wherein:
The communication interface of the predetermined communication standard is an interface that communicates so that one subordinately controls the other,
The image input device includes a dependent communication unit that is controlled in accordance with the predetermined communication standard,
An image display system, wherein the image display device includes a non-dependent communication unit that performs control in accordance with the predetermined communication standard. An image input device in an image display system in which an image input device capable of inputting and storing a plurality of images and an image display device displaying an image are connected via a communication interface of a predetermined communication standard,
Image display instructing means for instructing the image display device to display any one of the plurality of stored images,
When at least an image file transmission of an image whose display is instructed is instructed from an image display device that receives the display instruction and executes image display in response to transmission of the image file, the instructed image file is copied. An image input device comprising: an image file transmitting unit that transmits the image file to the image display device. An image display device in an image display system in which an image input device capable of inputting and storing a plurality of images and an image display device displaying an image are connected via a communication interface of a predetermined communication standard,
An image display instruction receiving unit that receives an instruction to display any one of the plurality of images stored in the image input device from the image input device;
When the instruction is received, at least image file transmission instructing means for instructing the image input device to transmit an image file of the image whose display is instructed,
Image file receiving means for receiving the image file transmitted by the image file transmitting means of the image input device based on the instruction,
An image display device comprising: an image display execution unit that executes image display based on the received image file. Controlling the display of an image by the image display device in an image display system in which an image input device capable of inputting and storing a plurality of images and an image display device displaying the image are connected via a communication interface of a predetermined communication standard A method of controlling image display,
The image input device is instructed to display any one of the stored images by the image display device, and when the image display device instructs transmission of an image file, the transmission is instructed. Controlling the transmitted image file to the image display device,
The image display device receives an instruction to display an image from the image input device, and when the instruction is received, instructs the image input device to transmit at least the image file of the image whose display is instructed, An image display control method for receiving an image file transmitted by the image input device based on the instruction and controlling display of an image based on the received image file.

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